96 ANIMAL ACTIVITIES. 
Commonly the spider builds her home at one side of 
the trap, and, holding in one claw a thread which she 
Fic. 86.—Water-spider and Nest. 
has connected with the trap, she awaits the vibration 
which warns her that an insect is ready to be eaten. 
If the pull on the line indicates a fly, she simply goes 
